BEGIN;

CREATE TABLE conversation_content_assessment (
    id                  uuid PRIMARY KEY DEFAULT gen_random_uuid(),
    public_id           uuid NOT NULL UNIQUE DEFAULT gen_random_uuid(),
    tenant_id           uuid NOT NULL REFERENCES tenant(id),
    subject_id          uuid NOT NULL,
    conversation_id     uuid NOT NULL,
    generation_version  bigint NOT NULL CHECK (generation_version > 0),
    meaningful          boolean NOT NULL,
    story_worthy        boolean NOT NULL,
    decision_reason     varchar(500) NOT NULL CHECK (length(decision_reason) > 0),
    model_ref           varchar(160) NOT NULL,
    prompt_version      varchar(80) NOT NULL,
    confidence          numeric(5,4) NOT NULL CHECK (confidence BETWEEN 0 AND 1),
    created_at          timestamptz NOT NULL DEFAULT now(),
    CONSTRAINT conversation_content_assessment_decision_check CHECK (meaningful OR NOT story_worthy),
    CONSTRAINT conversation_content_assessment_conversation_tenant_fk FOREIGN KEY (conversation_id, tenant_id)
        REFERENCES conversation (id, tenant_id),
    CONSTRAINT conversation_content_assessment_subject_tenant_fk FOREIGN KEY (subject_id, tenant_id)
        REFERENCES subject_profile (id, tenant_id),
    CONSTRAINT conversation_content_assessment_generation_key UNIQUE (conversation_id, generation_version)
);

CREATE INDEX conversation_content_assessment_conversation_idx
    ON conversation_content_assessment (conversation_id, generation_version DESC);

COMMIT;